Why do children and teens need to be so cautious about taking aspirin?

It turns out that during a respiratory illness, most commonly influenza (the flu) or chickenpox, giving aspirin to children can lead to a potentially fatal condition called Reye 's syndrome. Sudden brain injury and liver function issues are characterized by Reye's. It can lead to convulsions, a coma, and death.

the last statement is correct i.e.

when your heart is not pumping enough blood around your body because your heart is severely failing, you may need an artificial heart. an artificial heart is a mechanical device, about the size of an orange, that is connected to your heart or implanted in your chest to or replace a failing heart.